>>96346168
>Does anyone know a good resource for very simple, cardboard terrains?
Yes.
>WH40K Second Edition Style Ruins
https://mega.nz/file/7Vp02aqT#IakxIy2eMfC6xoVm5fGlR3ldvqXp6L52yRvQHXXIUv0
>Cardboard Battle Bunker as shown in White Dwarf 169
https://mega.nz/file/fdwUFITR#S0bsySPNMcSQURpaMlUqL1iOvq01VNTlotmlp-5g6qA
>Cardboard Shipping Containers
https://mega.nz/file/LIBSzCKY#P7EOnk-REGMCpH-wzDjSWB4ipkOsLFVCjQseM5kT81U